The first thing that should be noted is that we now use a resource called Holy Power (HP in this post and later ones). This change is what has thrown many former high DPS Paladins into the lowest tiers of raid damage. This is unnecessary. Just a simple rotation change must be done. Currently, our normal, no Wings/Zealotry up, is;
3HP/Hand of Light Templar's Verdict > Art of War Exorcism > Crusader Strike > Judgment > Holy Wrath or Consecration
Now, in Wrath, Art of War was almost always procced, because it was procced from a crit. Now, our auto-attacks proc it 20% of the time. So, this will make it seem slower, so just pace yourself.
Secondly, you must only use Templar's Verdict when you have 3 HP. Never before. Anything else is a DPS loss. Again, this may take time. However, we have a talent to help us: Divine Purpose. This allows your Judgment, Exorcism, Templar's Verdict, Divine Storm, Holy Power, Inquisition, and Hammer of Wrath to generate a Holy Power 40% of the time, so it may not go extremely slow when you get this.
Now, on to Wings. This talent is a staple Paladin ability that is always used. However, it has changed since the patch. Now, you can use Hammer of Wrath (Though a talent in Ret) throughout the duration of Wings. So, the rotation should be something like this:
3HP/HoL TV > AoW Exo > Hammer of Wrath > CS > Judge > HWor Consecrate
Other than the addition of the Hammer of Wrath in our Wings rotation, we need to stagger our CD's. I have noticed that, with current Threat changes, tanks that I have seen have lost aggro when multiple CD's are up. So, at least for now, try to stagger our 2 (3 at 81) CD's. After a Wings duration, use your 3 HP to use Zealotry. This abilities is our 31 point talent. It is our end-all-be-all of our abilities (Sucks, however....). This pretty much allows for a very quick 3HP TV, other talents not-withstanding. Our rotation in a Zealotry CD is:
3HP TV > CS > AoW Exo or Judge
With little room for other abilities, we must make the most use of the duration. With the proper haste (once a fairly useless stat for a Ret Pally), we can have a 3 sec CD CS. This will make the rotation TV > CS always.
Talents. Our defining feature in WoW. Without them, we fail. Hard. Worse than Gnomes. The most useful Ret Spec currently is, at 80; http://cata.wowhead.com/talent#sbbZZcbGsdkszfd. This is the one I use.
Art of War- A staple proc for a free, instant, 2x Damage Exorcism. This is essential (recorded a 22k crit in HHoR)
Seals of Command- Makes our Seal of Righteousness our lost Seal of Command, and gives bonus white damage. Makes for good damage on trash and a boss.
Rebuke- Cataclysm will make use of the long lost "Crowd Control" that BC had but Wrath forgot. A good interrupt will be necessary in Cata Heroics and Raids, I'm sure.
Repentance- A Pally Gouge. See above.
Just avoid the PvP talents and you'll be fine.
As for level 85, use this; http://cata.wowhead.com/talent#sbhZMZfbGsdkszfd. Basically, you just added another Judgments of the Pure, then Seals of the Pure and Eye for an Eye (Can be taken at 80, your choice).
Glyphs are a little intimidating, and, at least on my server, they are expensive. So, use what you can afford. But get these.
Exorcism- A fireball mechanic was added to Exo (20% of damage over 6 seconds I believe). This will double that extra damage.
Judgement- Extra Judgment damage is good, and Judgments are used pretty often, so take this extra damage.
Templar's Verdict- Our biggest attack with even more damage? Wheres the AH?
Hammer of Wrath- With Wings, Wrath is used often. Make it free, and it's even better.
Holy Wrath- With a change to this spell, it can hit all types of mobs, not just Undead, but only stunning them. This adds Dragons and Elementals to that list.
Ascetic Crusader- This reduces the mana cost of our Crusader Strike, so it can't hurt. And, besides, this is the only other useful Ret glyph.
These are not very important, as they only reduce the mana cost of your Seals and Blessings. Grab both Blessings, then your most used Seal.