Don't we already know?
The answer about text messages is no - you will not be able to send/receive text messages on the iPad.
Can you receive text message on an iPod Touch over WiFi? No. The type of 3G service the iPad receives is like mobile WiFi.
It's really not that hard people.
That's not really true. The solution to SMS messages on iPad is Google Voice. If you have GV number - SMS messages can be forwarded to e-mail and can be pushed to iPad (or iPod Touch) via a number of methods.