What if SonyEricsson calls the phone something else? What if they call it the Droid Gamer, or something along those lines?
To me, this phone is more about SonyEricsson becoming relevant in the phone industry again. I try to stay pretty informed about new technology (shout-out to Engadget, though it's just my 'main' go to site) and I can't think of a single SonyEricsson smartphone. I used to own a SonyEricsson dumbphone before I bought the HTC 8750 (I think those were the numbers might be 8250 but anyway) and the SE was a pretty good phone, but since the smart phone era began, they have been pretty quiet. These days it's all about Apple, HTC, and Samsung, Sony cannot be happy about that.
I think the Playstation branding is to create familiarity with a brand that I bet a lot of people don't know about, or equally damaging, have forgotten about.
The internets are buzzing about this phone, so if they change the name by the time it's released it will still have enough fanfare to add to the presumably massive ad campaign that will follow it's announcement.
As for the PSP2 I could see it having 3 or 4G, but maybe no calling feature, like the Kindle. This would avoid redundancy in their brands, while giving people online gaming everywhere. Not so bad a tagline before saying it does everything. Btw, I hate when Sony says the PS3 does everything, it doesn't play PS2 games, and it doesn't make me breakfast lol.
I don't think their will be redundancy in games really, this phone will be underpowered compared to the PSP2, which Sony is trying to balance power, battery life, and OVERHEATING (seriously? A handheld that might overheat?) so the games will be separate. Also, if Google is serious about competing with iPhone gaming they have to keep Z-System (or whatever they end up calling the gaming platform) as open-source as Android, something Sony has not been a fan of in this past, so getting Android gaming on the official PSP2 might be a little cumbersome as I doubt they'll allow for side-loading games onto the PSP2.