This is great news! Hopefully we will see it over on this side of the Atlantic on T-Mobile.
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Working at the place Where Dreams Come True and my BlackBerry Addiction is made stronger.
BlackBerry Curve 8900 with T-Mobile, PIN: 24AE9FC0
There are a couple of unofficial download links over in the Beta forum, where this has been available for a couple of weeks now. http://www.blackberryforums.com/wap/GetThread.php?f=118&t=213180&bat= (post title is " Beta 5.0.0.411 for 8900 leaked...." In case the link doesn't show up correctly).
I upgraded to this a week ago and have not had any major issues, very solid and nice interface tweaks. UI looks to be very touch-friendly, with all drop-downs converted to large buttons that would be an easy thumb target, even on something the size of the 8900's screen. My personal belief is that 5.0 is setting RIM up to expand touchscreen use across more of their line, so here's holding out hope for Dakota in 2010 =)
There's already an official release on the 5 series. Look at the Sticky topic on this 8900 section. The best thing is that YM and BB Messenger work without a BB data plan. ;)