My company is running the SBS version, too, and we're getting ready to renew our license.
I don't know when 4.8 was released and don't follow Avast's development, but figure that as the Home/Pro version likely gets the most use (Home is free, right?), they released it there first to shake out any bugs before releasing a new Netclient. ADNM lets you update the engine and VPS at will anyway. The only problem, I guess, would be if a 4.7 license wasn't good enough for 4.8. I wouldn't think this to be the case, but perhaps somebody could comment on how Avast handles upgrades?