A PTR is going up "soon", perhaps within the next week and we're going to start seeing spec revisions not long after. Following Kina's post about Holy's issues and the dominance, for what it's worth, of meters by Discipline, what's at the top of your list for tweaking?
For me I think Holy needs an overall buff of simple numbers to make up some of the deficit to Discipline, just as a start. Not a huge one mind, Holy isn't utterly terrible right now, but considering how similar the heal style is to trees you'd expect they'd be closer. One of the things you have to bear in mind when looking at a site like raidbots is that WoL doesn't calculate damage mitigation from talents like Inspiration and Barrier. If you do some simple math on your own logs you can see just how much that can be worth and as far as I can estimate it puts Discipline in the same ballpark as druids if good use can be made of Barrier. Only that leaves Holy even further behind, comparing the two specs.
The interesting distinction between Holy and Discipline is while disc has amazing tools if you know when and where damage is going to hit, if you don't, trying to fix it up afterwards can be a pain with the party limitation of PoH (and much reduced HPM if DA isn't used) or otherwise having to pick people out with Penance/GH. Holy isn't quite as clunky in those situations not least because of CoH being a smart heal. That's a pretty small niche to be good in with the way encounter design is right now, though, how much random raid damage did you find yourself scrambling to keep up with in T12 compared to the predictable bursts?
My favourite idea so far is to buff Holy's PoM when the player affected is standing in Sanctuary, gives you a better use for Sanctuary and more throughput at the time you likely need it most. Hell, you could make it a talent and replace the useless State of Mind while you're at it. Would take a little more work to implement than straight number tweaks but synergy between spells is a nice thing to have, makes a spec feel complete.
So what would you do? Would anyone just throw in the towel and ask for Renew to be much more like Rejuvenation?
edit: well, whaddya know, MMO-Champion have some notes up on the new PTR build with a Tranquility-esque Divine Hymn replacing State of Mind. Guess someone did throw in the towel on making Holy more like trees.