1-are you the "official"guy in charge of the development of the game engine?
Nope. I'm not even a game engine programmer.
Heck, I'm not even a game engine user -- but I
do think Blender would be worse off without the
game engine and I think it would be a cool thing
to learn some day when I get more time.
2-if not.then who is?
That job appears to be vacant. The main problem
with the game engine is it was designed so that
people who don't want to do much programming
can make games ... and as such there don't seem to be
many programmers among the users of the game engine.
3-what is the status of the development of the blender game engine?
There is currently no development going on that I can tell.
Back in October Norman Lin, former with NaN, initiated the
integration of the ODE physics engine into Blender's Ketsji game
engine with the hope that other's would extend his work.
Sadly that hasn't happened yet. Thanks to Phase, the
2 game engines were ported to tuhopuu/funblender,
but Phase isn't a game engine programmer either.
It is very important that some programmers from
within the game engine user community get involved
soon and kick start development because if current trends
continue, it seems very unlikely that programmers from
outside of the game community will spend much time on it.
Now some better news: I've been helping a few game engine
users get blender compiled on their systems so hopefully
they will eventually get familiar with the code enough to
extend it in new directions. If anybody else needs help
compiling and figuring out where things are in the sources,
feel free to come to the channel #blendersauce on
irc.freenode.org and ask any of the folks in there.