From my reading the old equation of Shoshonk = Shishak is most probably correct. Rphl's alternative requires that the Biblical account uses a relatively obscure alternative name for no apparent reaon.
I would say that Rohl has some interesting ideas but the weight of evidence is against him, and his own tendancy to jump to conclusions undermines his chances of finding anything of genuine value.
The real upsets will probably come from the archaeologists working in Israel now. There is a very real dispute, for instance, over whether there was ever a united kingdom ruling Israel and Judah - it is possible that the historical David and Solomon (if there were such people - that is itself not certain) ruled Judah and not Israel.
I would suggest reading _The Bible Unearthed_ by Israel Finkelstein and Neil Asher Silberman, as an introduction.