Blogs
The Change Headed our way
If this is your first encounter with the release of an expansion pack in a competitive, multiplayer video game, there is simply one thing you should keep in mind for March 12th: Starcraft 2 will be insanely different.

this expansion, not brood war.
It is not safe to assume that your standard play style – whether it is legitimate, or focused entirely on the coin flip nature of a cloaked unit – will be remotely capable of winning. Don't go into it with a dogmatic view and the believe that the old style IS the most appropriate style.
If you are a person who looks at the new expansion and thinks “well... nothing changed, really. There's not much new, I'll just do exactly what I do now!” then you should really think to reevaluate your approach to the new expansion.

*cough cough*
Look at it this way: your race may have had nothing but minor changes – which really isn't how it is, but that's beside the point – but you're still going to have to worry about your opponents and their races differences.
As well, while the game is in beta, you mustn't expect the utmost balance upon release. The nature of a competitive game dictates that imbalance is always present, because without that imbalance, there wouldn't be a means to find potential for innovation in races, and would lead to an incredibly stale, unpleasant game after the first few months.
that's why they were once *so* balanced
If you have the intention of making a big debut in Heart of the Swarm, or getting off to a great start early after launch, there are two things to do: get into the beta (which I am going to assume anyone with these intentions has already done), and watch replays of players who are proving to be sensational in the beta.
Don't fear the change that will occur on March 12th: the game will be different, but that is, by definition the point of change. If you are worried about the changes made to your race, don't judge them harshly before trying it, and keep an open mind to changing your race.
