From my recollection of the DA datasheet which leaked (I wish I had saved it, dammit) and masters slides, the 144pin TQFP/LQFP version comes with 32MB on-package DDR2 RAM, no external DDR2 bus. The larger, BGA only packages support up to 128MB external DDR2.
It also has full SD-Card support on the SQI bus, so booting Linux from an image on SD is supported.
I wish they had retained the FPU, as now it looks like we will have decent graphics speed with the on-board 2D accelerated 'GPU', but have lost the processing horsepower to fully take advantage of it. Go figure.