I have a priest alt getting close to 70. Planning on doing healing come Wrath. With the conversion to spell power should I be picking up healing gear or damage gear right now? How is, for instance, Spell fire stacking up against Primal Mooncloth? Is spellfire actually able to heal better right now in the beta? How about damage?
I strongly recommend hopping over to Wowhead's Wrath site and doing some research on how the numbers turn out. In most cases, DPS gear has better DPS stats (hit, crit) and Healing gear has better Healing stats. The spell power numbers are just much, much closer. In your particular example, the Primal Mooncloth Robe has more spell power than the Spellfire Robe, but it has mp5 and the Spellfire has crit. A DPS spec/class would rather have the crit.
A few weeks ago I covered the effects of the spell power change in Hybrid Theory, with some raw numbers to look at. You can read that over if you'd like, but I mostly just suggest hitting up wotlk.wowhead.com for specific items.
For more answers to your questions, read on!
Is there actually any limit to the number of pets/mounts those new windows can accommodate? I'm assuming they work like key rings (growing larger as you get more stuff), and I hope I'm not wrong on this.
As far as we know, there is no upper limit to how many pets or mounts you can learn. As another reader mentioned, there's an achievement for having 50 pets, so you can have at least 50. I imagine you can have many more than that.
Are there any changes to fishing? I don't mean new fishing areas, or fish, but are there any changes to the *mechanics* of fishing? Or is it the same boring process as before?
No new mechanics yet. They've stated that they want to spice up the Fishing mechanics, but it hasn't happened so far. Personally, I like it that way. I fish when I'm watching TV or reading a book. Gogo relaxation time!
Now that the king is back, where did Bolvar and Prestor go? I'm wondering how the Onyxia attunement chain in particular will work.
Currently in the beta, that chain can't be completed because Prestor is indeed missing. The Missing Diplomat works for the most part, except for the fact that Wrynn is right there in the Keep. That's just awkward. If I had to take a guess, I would say that they're going to use World Phases to patch this up. You see Stormwind as it has been for the last 4 years until you've completed certain quests or hit a certain level, and then hey! The king is back!
Do the two talents Improved Spirit Tap and Meditation stack?
Is there any storyline in beta so far involving Jaina Proudmoore?