You have no idea if there will or will not be a removable battery right?
why do you (or anyone) want HDMI out on a phone? It's running Android so if there's something on it you want to watch just plug it into a PC in mass storage mode.
Yeah, I'm wondering if what look like optical touchpads can ever be as good as OpenPandora's flat analog nubs.
No, tilting isn't required, especially for a gaming device. I've played hours of Advance Wars on my n810 and have never wished for a tilting screen.
No, four shoulder buttons are not required. Very few games need them.
Yes, 512MB of ram is enough. A PS3 only has 256MB of system RAM and 256MB of video RAM and it needs to support 1080p video. A playstation phone won't have a full HD screen so it won't need as much vRAM.