To add a bit more to what our newer, angrier Moe just said...
PB is without a publisher, so they have no income. They are presently living off whatever cash they have sitting in the bank, with no hope for revenue from G3. Unless their parent company (if that's what Pluto 13 is) has deep pockets, they are now paying for everyone's salary from whatever is left in the bank.
This is the same situation Troika was in after Bloodlines shipped. If a small dev house does not have a publisher and a new game lined up when their current game ships, they either pay everyone from existing funds, or they lay almost everyone off. Given the protracted time since G3 shipped and the assumption that PB is not getting any new revenue (or development funds from JoWood for a patch), their cash reserves are likely running dry.
At this point, they know exactly how long they can go before they run out of cash. I've heard it takes an average of 6 months to land a new project for a dev house. Since they were in negotiation with JoWood, they were probably not looking for anyone else to publish with them. Unless they have enough funds to keep everyone on the payroll for the next 6+ months until they land a new project, they have to lay everyone off.
I haven't been paying attention to their financial/business info (and it's probably all in German), but they're basically doomed at this point. There's only a few options:
1) Deep pockets: if they have enough in the bank, they can try to weather out the storm until something new comes along. Unlikely, since they're small. Does Pluto 13 have cash reserves? I don't know.
2) New publisher swoops in within the next few weeks and starts them on a new project. This is a crap shoot, but their best bet for survival.
3) Lay off 90% of the workforce, keep a few key people (sadly, this usually means managers), try to hold it together for 6-12 months, land a new project, then build a whole new team, and try to hire back any available people.
4) Call it quiters, lay everyone off, and put a bullet in the horse. It's all over.
5) Standard corporate variation halfway between 3) and 4) -- Declare PB out of business, a few key people shop around for something new, and form a whole new company a year or so down the road, usually trying to hire back some of the team (which seldom works, since by that time everyone's moved on to new pastures, and you only get back the ones who hate their new jobs). This has the advantage of dry-cleaning your image, since it means a new corporate name, while often retaining the same corporate mismanagement problems that hurt the company the first time around. (Not implying PB was/wasn't mismanaged, but in general if it was there the first time around, it's still there the second time around.)