Yes, there will be some new cloud-related stuff in v7.
And of course, it's not like we're dropping any of the existing detections - this is simply another layer on top of the existing engine.
Also, most of the attention is payed to newly downloaded files. To make a query about such files will typically be much much faster than the actual download, so we can do things even on weaker connections (I mean, if you're downloading a 20MB file over a dial-up, and it takes you minutes, you can typically wait 1 more second to get the result of the scan, especially if it's happening seemlessly on the background).
Thanks
Vlk