I've been playing around with ways to make a "gishy" 4E monk that doesn't just spam FotFS. To that end, I wanted to pump WIS over DEX/STR, since that's the casting stat. Then I figured I'd take a level of Nature Cleric (Druid should work too) in order to pick up Shillelagh, letting me use WIS as my attack stat, at least for the main-hand staff. Unfortunately, I discovered that this does not work. With only the Nature cleric level, Shillelagh works as it should and I get my (higher) WIS bonus to attack/damage. But as soon as I take a monk level, *poof*, the bonus goes away and reverts to my (lower) DEX value. This seems like a bug, though admittedly probably not a high-priority one.
On the plus side, it seems that you do get the BA unarmed attack after FotFS even if you are using a shield. This also seems buggish, so I guess they cut both ways

.