Considering the fact that HBS has kickstarted three other games (Shadowrun Returns, Shadowrun: Dragonfall and Shadowrun: Hong Kong) and I haven't heard anything about any "foul play" regarding those games, I feel very confident that HBS isn't out to just fill their bags with gold. They might not be able to release the game in May and it might seem odd that they release the beta without customization rules for `Mechs initially, but it is their first time releasing a beta for the wider audience than their internal Q&A team. That makes them nervous.
I think that HBS really does not want to screw this game up. The BattleTech fanbase is quite small compared other popular games, but those guys are pretty hardcore. If the game fails commercially, there probably won't be another turn-based strategy game set in that universe for a long, long time. Making sure that the combat in this game works well by providing some form of "early access" (to people who are huge fans of the genre or at least interested enough to hand out their money) makes sense in my book. I'm looking forward to the campaign and the random sidemissions, but if the combat feels "meh", than all the campaigns and story in the world can't save the game.
But then again, it is a pretty small game studio, without a big publisher backing them. I don't know how successful the shadowrun games are or how many copies the Necropolis game sold (a game that I didn't like myself). So, I hope like some of you that it isn't a case of rushing it out the door. I really want the game in my hands right now, but I rather have it by Christmas and be great, than be May and "okay".