IMHO, the decision was simple. It'd been three years since the release of 4. Sales were no doubt slacking off, and I'm betting the giveaway of 3, which was hoped to enfuse some cash into the company through purchased upgrades to 4, didn't pan out monetarily quite as much as expected. So CL could either continue working on 5 without release and subsequently find themselves going under because of cash flow, or they could release it with errors in place that could be corrected with a later patch. Which would you have preferred? A buggy 5 that can be fixed, or no 5 at all?