Adhesive Games' Hawken was released in December 2012, before which we talked about it quite a bit on Kotaku. It then went missing in action for the majority of 2013, only to surface recently with the announcement that the game would perform a reboot of sorts on Steam. Well, you can now purchase the title via Early Access, though the currently-not-but-once-was F2P game has a price tag of $US29.99.
Confused? Basically, dropping $US29.99 gets you the "Nemesis Bundle" and the ability to play the game while it's in Early Access "beta" — an opportunity for the developers to iron out problems as a result of moving to Steam. Once the game leaves Early Access however, it'll transition back to being purely free-to-play, at least according to the FAQ.
Previous account owners will automatically be sent Steam keys, so they're (rightly) taken care of, while those who wait until the Early Access is over can join in without any initial expense. It doesn't make the Early Access particularly appealing unless you're incredibly desperate to play the game.
All being fair, $US29.99 doesn't just give you the right to play, you also get a bunch of mechs, a repair droid and some in-game credits. Unfortunately, these "gifts" don't really do much for you if you decide the game isn't for you. It just seems like the best option is to wait for the Early Access period to end, unless I've missed something.