There's no doubt about it, Quest have made a lot of acquisitions. I've previously worked for a company that was acquired a few years ago (although admittedly it happened after I had left).
I'm still trying to work out how significant this purchase is. Quest undoubtedly have a big presence and their ownership of vKernel will probably help the latter out. I'm going to re-familiarise myself with both companys' products lines as I'm interested to see if there are any overlaps or where the possible gaps are.
See vKernel's announcement of the acquisition here.