We can't speculate on release dates as per the Terms of service of the forums, however seeing as the 128GB version was just released a month and a half ago. I wouldn't expect anything new for a while
If you want an iPad now, get it now.
This is an iPad user to user forum. Apple doesn't read or respond. Plus we can't speculate or respond to speculations from other sites. You'll just have to wait until Apple makes an announcement.
I guarantee you there is ALWAYS something new coming out. Weeks, months whatever away, always a new piece of tech. just like I know every time I buy something, it goes on sale the next week, without fail.
If you never buy and always wait for the newest, youi'll never get one.