Blizzard's class dev team is probably estatic at how their changes have worked out for Holy Paladins. Holy Paladin theorycraft is all over the map at the moment. As I can see it, there are currently three different stat weights being discussed.
1. Intellect > Spirit > Haste > Crit > Mastery
The standard build from 4.1. It's still the best build if you have to raid heal, and is also the most versatile build.
2. Mastery > Intellect > Spirit > Haste > Crit
The ultimate single-tank healing build. Insanely large mastery shields buffer the tank's health. Probably only viable in 25-man raiding with good raid healers to cover for you.
3. Intellect > Mastery > Crit > Haste > Spirit
Eloderung of Eternal Reign is touting this build. He says that it is a very strong two-tank Beacon healing build. It relies a bit more on Holy Light, and takes advantage of all three new mechanics: 100% HL transfer through Beacon, 200% crits, and a stronger mastery. Unlike build 2, this is likely a viable build for 10-mans.
This is probably the most interesting time to be a Holy Paladin in a long while. Excellent work, Blizzard!