Sony Ericsson have announced the P910! It's billed as a 'minor' upgrade, but in my opinion the major benefits are 64MB internal ram and access to Memory Stick Duo Pro (up to 1GB!). Not to mention the non-virtual QWERTY keyboard! The screen has been upgraded to 200k+ colours too, but that's not a big issue for me.
Breaking the 128MB barrier will make a huge difference. Instead of storing 6 albums of music in 48KHz ogg format, we're now talking about 48 albums. In my eyes 48 albums is a full-fledged music player, whereas a 6 album capacity was just a phone that dabbled in music. In a similar vein, we're now talking about 8 full length SmartMovie xvids per Memory Stick instead of just 1. Finally, we're also talking about enough storage for a movie in a VHS quality format now - think Divx or VCD/KVCD! Granted, it will take a phone with a beefier processor than the P910 has now to play back VHS quality Divx or MPEG1, but imagine plugging your phone into a 50" TV and playing back a movie...
Update: I'm not sure how I ended up posting this after the previous entry about the P900 firmware update, but there you have it