I've not even looked at it once, to be honest, and wouldn't expect to give it much thought after the official release, either.
I'll also be very interested in what license they release the source material through. If it's anything like 4e's license, rather than OGL, I will very likely steer clear.
I had completely forgotten to mention this, thanks for bringing it up.
The OGL of 3.5 lead to several companies jumping on board and adding tons more content to the game, sure stuff was open for people to use, but by default it brought a lot of traffic back to the base game of D&D. 4E's license was so backstabbingly worded and set up so that WotC (well more likely Hasbro) could beat any and everyone they saw as a threat out of the running, or simply lawyer them until they gave up, that most of the 3rd party sources went completely elsewhere. This is more or less what led the rise of D&Ds biggest competitor now, in the form of Paizo's Pathfinder.
I've heard rumor mill type stuff that it'll have a new license, more lax than 4e's piece of crap GSL but not quite as open as the OGL. I think one lesson WotC learned from the 4e era is that having 3rd party publishers is good for
them, and doing things to actively screw over 3pp causes those companies to focus their market elsewhere. The terms of the GSL actually got a little more 3pp friendly during later revisions, which - to me - is also a sign that WotC/Hasbro recognized the mistake.
Not only did the GSL lead to the rise of D&D's biggest competitor, it also lead to other systems being created too. In the 3e days, companies flocked to create their own systems based off the OGL and d20 licenses. Despite what Hasbro's lawyers thought, that was good for WotC and good for D&D. Small games - Mutants and Masterminds, etc - all using the core mechanics of D&D make D&D more popular. 4e made it impossible to use the mechanics of the system for a different game; and so you get systems such as Sword & Wizardry (from Frog God Games) and Dungeon Crawl Classics (from Goodman Games) that use the OGL to make 1e clones. And then you see an explosion of whole new systems, each with their own mechanics. And all of that stuff
could've been tied to D&D, and instead works to fracture the market.
So my hunch is the lawyers learned a lesson, though it had to be done the hard way (by beating them over the head with sales numbers). [My personal opinion is that the GSL is the
primary reason for the failure - relatively speaking - of 4e.]
If the rules are released in an SRD, I'll take a look. I'd be crazy not to, if it's something that I can use to get more freelance work. But if, like 4e, the only way I can see rules is to buy books then I don't think I'll be getting sucked in again. [Another personal opinion: an open playtest, to me, is also a hint of a more open game system; those rules are already out there, so trying to lock them up afterward is difficult.]