I think I'm going to run 4 shaman and a pally in xpac.

You really need a dedicated tank in xpac for instances since resil does not work in PVE. Maybe if you're supremely geared it will be less of an issue.

For BG's I'll put healing gear on the pally and set him to auto-heal when I spam attacks on the shaman.

That's my plan right now. I tried 5 shamans in a 80 instance and I just got creamed - it just didn't work.

So pally tank, 3 shaman dps, 1 shaman healer for PVE.

4 shaman dps, 1 pally healer for PVP.

is my plan ATM.