I for one will be seriously disappointed if the two are not merged installs, but I'll admit, I'll buy it anyway. One of the first things I thought when I booted up CloD was oh my God, imagine how much fun this will be once more planes are available (I'm not much of a Spit guy)! With every plane feeling so different I'm looking forward to seeing how new additions will behave. I quite like the Russian crates (especially the mig-3, although I haven't the foggiest clue why haha), and I would love to get my hands on a centerline 20mm for the 109 without fussing with all that convergance mess.
Having said that though, I think it's absolutely terrible both in a business sense and in a customer service sense to not give CloD all the features that were promised. If it's simply a matter of a patch coming out for CloD at the same time BoM is released then that's all fine and dandy, but if those who choose not to buy the sequel/add-on/whatever you want to be anal about calling it can't get all the features that were supposed to be in the game in the first place, well that's just not right and I expect betetr from a team that relies so heavily on its relationship with its customers.