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 Blackberry finally released their upgrade to the Blackberry Curve 8300 with the new Blackberry Curve 8900. The phone has a similar look to the bold but that doesn't mean it's the same phone.

The Boy Genius Report had some hands-on time with the bold and they made some really good comparisons

The size is awesome — totally small enough to be pocketable, but not too small where sacrifices on the keyboard had to be made.
Unlike the Bold where some people had trouble hitting the right convenience key since it was too low, on the Curve 8900, it’s located perfectly.
The screen, as we’re getting accustomed to now with RIM, is flawless! It’s smaller than the Bold as you know, and that’s an even denser, crisper, and sharper display in our books. Really a job well done.
What about the keyboard? Even better than the first Curve. The keys feel more “fuller” and not hollow like the original 8300 did. They’re also decently spaced, and even after using a Bold for 5 months, the second we picked this up, we were off to the races. Another great execution by RIM.
It might just be us, but the fake chrome bezel around the 8900 actually seems like it’s more equipped to handle rough usage than the Bold is. We could be wrong, but at first glance it looks like a tougher material or finish. You know how our original Bold fared…

The one major disappointment with the Curve 8900 is the lack of 3G. Engadget went as far to say

...[t]he lack of 3G is going to be a dream killer for many, but we could see this one getting some retail legs underneath it if the price is right -- it's got WiFi, after all.

Crackberry.com disagrees with the complaints of the lack of 3G. They think it would be nice but not necessary.

...[t]he lack of 3G here was never even a factor for me, at least in the short time that I have had the device, and I think that will be the cas moving onward as well. I guess the best way to put it would be that while it would be nice if the 8900 had 3G, the device itself is so good otherwise that unless you really need to talk and email at the same time the few extra seconds for browsing and downloading compared to the Bold shouldn't deter you from considering this as your smartphone of choice. From the sheer amount of people that have said they are waiting for the Curve 8900 over all other devices out there, I don't think RIM will have any issues getting these devices off the shelf. The 8900 is definitely worthy of the Curve name, and is a next step to build upon the success of the 8300 series.

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What is GSM and non-GSM?

GSM is a mobile phone technology that uses TDMA (Time Division Multiple Access). GSM stands for Global System for Mobile communications. The competing system is CDMA (Code Division Multiple Access). GSM and CDMA are not compatible systems. If a phone is designed for GSM, it will not be compatible with CDMA and vice-versa.  

What is Unlocked GSM Cell Phone?

An unlocked GSM Cell phone is a mobile phone that can work with any sim card and/or GSM service provider. Please note that at least one of the GSM Bands in the phone should match the GSM service prodiver's bands.  

What is Sim Free Cell Phone?

A sim free Cell Phone is a phone that is not locked to the sim card of a specific carrier.  

What is a Sim Card?

A Sim card is a small plastic chip (looks like a memory card to some) that contains a microchip. This microchips is the heart of your phone, it contains your phone number, your address book, and the necessary information for your phone to work. All sim cards look the same, but the microchip inside is different for every GSM service provider.  

What is a GSM service provider?

A GSM service provider (carrier) is a company providing you with a working line and phone number. To do this, they will provide you with a sim card.  

My GSM service provider does not have sim cards, why?

If your service provider does not have sim cards, then it does not use GSM technology. Our phones will not work with non-GSM service providers.  

What are GSM Bands 900/1800/1900 Mhz?

GSM technology can work on up to 4 frequencies: 850 Mhz, 900 Mhz, 1800 Mhz, and 1900 Mhz.

Some GSM phones support all the bands or frequencies, or just a couple. A dual band phone supports only two, usually 900/1900 or 850/1900. A tri-band phone supports three bands, either 850/1800/1900 or 900/1800/1900. A quad-band phone supports all GSM bands. Quad-band phones are able to work with any and all GSM service providers.
On the other hand, GSM service providers support just a subset of all the GSM bands available. Before buying a GSM phone, make sure the phone supports at least one of the bands that your GSM service provider supports.

Do I need a contract to buy an Unlocked Phone?

No. A contract is required between you and the GSM service provider for you to get a working phone line.    

No service plan included?

GSM service providers offer phones at discounted prices attached to their service plans. The catch is these phones are locked to their sim cards. You cannot use them with other GSM service providers. Our mobile phones are unlocked, they reflect the real market price of a mobile phone and they are not locked to a specific GSM service provider. That's why we do not attach any service plan to them.