i) AFAIK only in Japan as they just announce their price drop for Vita (both 3G/Wifi n Wifi

) For other region need to wait from respective regional Playstation sales what they said either to follow or maintain the price.
ii) NO & NO. Be careful on what you ask, as in this LYN forum especially in this Playstation subforum, NO Jailbreak, Pirated games or any leads to PIRACY are STRICTLY PROHIBITED. Plis abide the rules as if you ignore it, u may get 'banhammer' read here for more >
http://forum.lowyat.net/topic/1577932iii) for starters, for me Gravity Rush n Uncharted. As these 2 games fully use the function of Vita.

(of course, it depends on people taste in what genre of game they want to play.)
iv) REFER TO NUMBER ii.
v) no comment, but it looks nice to apply it to Vita, but for me I prefer Naked.

EDITED:
oh btw, IMO, for starters, straightaway upgrade ur Vita mmc to 32 GB and subscribe to PSN Plus

. buy 1 year get 3 month free and and get free some PS Vita game and PSP games as well.

I heard that you can't play psn+ free games if you unsubscribe from psn+ is that real?
If I ask my friend to buy a ps vita for me from Japan is it working at Malaysia ?
Is the ps vita a region free console ?
yup it is working, psv is region free. But you might need to get a converter for the power supply or a local charger.