Of course you can exchange it for the Moto Bionic...... if it comes out within 14 days of your purchase date. Which is your only Exchange/Return period.
I don't know if it will be coming out within the next two weeks so perhaps you may want to go get a feel of the other two 4G LTE devices VZW offers and see if one of those are up to your standards if the ThunderBolt is not. I did not like the TB and actually left VZW because of it and now have come back and enjoy the Droid Charge quite a bit.
iPhone 4 - 550 Min Fam Plan w/ 5 F&F | Unl Data | 1500 Txt | Home Phone Connect (2nd Line)