for question 1 :yes
until now sony not yet release jb for xperia p maybe later. about kernel you can use current kernel or use modification kernel,its will work for any rom.
How Sony didn't release JB for XP??
Do you even cgeck the XP development ??
We have already JB for a long time for our XP !!!
Lol hahahaha !!!!
Just look here: http://forum.xda-developers.com/show....php?t=1938296
Flash the JB 1.100 ftf with flashtool and you dont need root for it and after flashing that ftf you can root it and install cwm ( The one for ICS works also on JB ) then you can flash any JB custom for locked bootloaders !!
Search and read before posting a new thread then you will learn and please dont post questions after questions !!
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