First impressions:
Sadly, I couldn't understand much of the dialogue. Just basic stuff and occasional transliterations like "Bigu Bossu!" and "Sunekku!"
The visuals are some of the most impressive I've seen on PSP. The graphics are just top-notch. They also maintained the sketched art style from Portable Ops but they took it further, giving the cutscenes a very graphic novel appeal.
Sound is quite good. They've paid special attention to the simple sound effects, primarily foot steps, as with previous Metal Gear Solid games. The environment and ambience effects are very immersive as well.
Down to controls. They've definitely refined the control scheme, making the default match what I had already done with PO anyway (stick to move, XOST to look, and d-pad for commands). Just as with PO, you have full control over the configuration, almost in a PC game style where you can bind any key to any command.
They've removed the first-person cam, opting for a an over-the-shoulder when yuo hold down the aim button. They have also addressed the control swap issue I mentioned earlier, keeping the same controls and minimizing any confusion. The most notable difference, however, is that Snake can now move while crouched rather than lying on the ground and dragging along. Lying in prone now seems to make you completely stationary. They've also added the Auto-aim feature from MGS4.
Overall, it seems like the game has had a lot of influence from games like Syphon Filter and Resistance: Retribution, at least in terms of the camera and controls; making it much easier to pick up and play. But it seems to be more action oriented rather than abiding the stealth tradition of the Metal Gear Solid series.
I'm definitely considering it now but just to be sure I wanna try an English demo first.
