This is announcement of ministry of Land,Infrastructure and Transport
http://www.mlit.go.jp/kisha/kisha05/09/090829/01.pdf (pdf)
http://www.mlit.go.jp/kisha/kisha05/09/090829_.html (japanese source)

It says
Regulation application time
(1) 126--250cc and under 50cc
2006 October 1st (new model)
(As for continuous production bike and imported bike(to japan), 2007 September 1st)
(2) 50--125cc and over 250cc
2007 October 1st (new model)
(As for continuous production bike and imported bike(to japan), 2008 September 1st)

Many of carburetor bikes in japan may disappear or become FI due to this tightening of emission regulations(to same level with euro3 : HC:0.3g/km). Test mode will be "cold start style" so carburetor bikes won't be able to pass. It starts from Sep.-08(bikes under production)/Oct.-07(new model).
ZRX1200R,Zephyr750/1100/ZR-7 will disappear. XJR1300 will get FI and survive.(according to bike magazines. Regarding W650 I heard it will get FI instead of carb from kawa shop(as rumor).

edit : XJR1300 with FI officially came out.
http://www.yamaha-motor.co.jp/global/new...10/xjr1300.html
I hope W650 follows next!

At present I haven't heard about Estrella yet.
(regarding 250cc class,regulation start from 2007 sept-1st:1year earlier).
I found ZZR250,D-Tracker,KLX250 07 model in Kawasaki HP,they seem to have changed only color compared to 06 model(curious what will happen in next september though..).
Regarding Estrella, I haven't found 07 model in Kawasaki HP(below)yet.
There's also TR250(trail model with same engine of Estrella), but I haven't found 07 model either yet. Situation is severer in 250 class than bigger bike(how much cost they can spend on emission)generally I think.

I sometimes check "Information"(center part) of below address if 07 model is added.
http://www.kawasaki-motors.com/mc/

ZZR250
http://www.kawasaki-motors.com/mc/kinfo/07new/07ex250h.jsp
D-Tracker
http://www.kawasaki-motors.com/mc/kinfo/07new/07klx250m.jsp
KLX250
http://www.kawasaki-motors.com/mc/kinfo/07new/07klx250h.jsp