All indications are that T50 will not come in any capacity larger than 1GB. T60 has the same size color screen but a lighter and smaller form factor and comes in 1GB as well as 2GB or 4GB capacities.
But you pay dearly in battery life. T60 is rated 19 hours on its AAA while T50 rates an incredible 52 hours on its AA. At least iriver learned from their mistake with the T30 and included the FM tuner/recorder in the AAA T60. (Only Asian T30s had FM.)
No official indications of any plans to make T50 more than 1GB, only rumors and speculation on various DAP message boards. I wonder how many of those rumors started as a result of the pre-release review
still posted at CNET's Crave site, which not surprisingly was completely wrong.
They claimed T50 and T60 would both come in 1GB, 2GB and 4GB, and further claimed a 20 hour rated battery life for both models. For anyone who's curious, here's the link to their (completely wrong) review:
http://crave.cnet.com/8301-1_105-9675843-1.html
Better to get info here at MisticRiver or at Jenn Lee's Pocketables site rather than CNET, Crave, or other DAP message forums.
By the way, can you provide a link to exactly where you "read that the chip's outdated" on T50?