New preview up on CVG (I didn't copy it all, so check out the site)
CVG: The Pyro - easily the most useless of TFC's line-up, has gone from a minor annoyance, spurting 2D flames that'll only get him rocketed in the face, to one of the most important members of the team.
Flames now deal serious damage (and look fantastic to boot) - two full burns will finish almost anyone off.
Because of this they've become a great class for running into a giant ruck and causing pandemonium for the opposing team (friendly fire is totally non-existent in TF2). Sticking close to the walls and jumping around corners seems to be the best strategy, and half the time we were racking up more kills than the Heavys on our team (not pansy Heavys either; rock hard Valve tester Heavys).
The Pyro is well and truly back in the game.
Besides the Pyro, the Medic has seen the best changes from TFC's template. Replacing the primitive, incessantly beeping medpack is a Ghostbusters-style heal gun, which locks onto a target teammate with a stream of healing plus signs. As long as you're in range and holding the fire button, the healing stream will stay locked-on to your target, leaving you to hide around corners or behind cover.
Simply put, the Medic is now a massive part of the team. A common strategy in our games was to pair a Medic up with a Heavy, allowing the big guy to take on the frontline while the Medic healed from behind. Of course this makes the doc a massive target for spies who'll stream in from the rear with their new cloaking toy, knife drawn. This makes for a frantic see-saw act as the medic keeps the heavy topped up, while he scrambles to spot any imposters coming for his wingman.
Taking one for the team
The biggest twist in the Team Fortress formula, shaking the foundations of every strategy and tactic you've relied on in the past, you probably won't notice on your fast few goes.
Realising that really, there's no point in being a Medic or Pyro if you're not going to get any kills, support points have been brought to the forefront of TF2's makeup. Pay attention; This is the bit that warrants the '2' on the end.
Before, if you shot the cack out of an enemy team member only to have a snipers blast him in the head, you'd get bugger all points despite the fact you dealt the most damage. In TF2, anyone who gets a shot on target gets a point. So if a Scout gets a few shots off, a Pyro brings on the flame and then a Heavy finishes the target off, all three players get a frag.
For even the most rabid TFC players then, TF2 is looking like its going to live up to those nigh-on seven-year-old expectations. But of course you don't have to take our word for it; it's on Steam today for you lucky pre-purchasers. We heart Team Fortress.