According to The Source preview the PS3 saw a big boost to at least 45k, obviously it's not gonna stay at that number for long and will go down in the following weeks.
Looking at gamefaqs, I see the following releases in Japan:
Out of those games, the following should interest the Japanese:
Initial D
"The Best" for NGS and Ratchet and Clank
Tears to Tiara
Siren
Soul Calibur IV
Afrika (maybe)
Considering everything stays the same, i.e. no price drop or Software Emulation BC added or anything like that, I predict the PS3 sales will stay over 10k/week until at least the end of July.