I'll buy it in no time if it has...
1) 4 inch super amoled capative touch screen with multi touch support.
2) PS2 emulation officially
3) Bluetooth 3.0 with file transfer to any device
4) Wlan b/g/n and 3g
5) Mobile phone support (gsm)
6) Front & Rear cameras with (720p) hd video recording and still images
7) Two analog sticks
8) Browser with full flash support
9) Nextgen umd drive with up to 10gb data storage
10) 1ghz dual core cpu, 256mb ram and offcouse dedicated gpu.
And even if its price will be 300$ i'll definately buy it on launch day.