I wouldn't be too concerned. I think Lee/Wasps are just taking time to assess the current situations.
If you look at who we are losing that we realistically know of and are/or fairly certain will leave.
Definite
Owlett - Never really got an opportunity and has decided to move on. Replaced with Millar Mills
Rowlands - Big loss and fantastic squad player but with International Duty, can we really afford to lose him and Launch every time internationals are on?. Stooke likely to replace.
Likely
Taylor - Shame to lose but most likely on decent cash and with Cruse, Oghre and Barbeary well stocked. Likely to get another Champ player or squad player from Prem.
Brookes - Great scrummager but looks knackered/injured a lot. Discipline lets him down sometimes but currently no clear replacement. Should have some cash to replace him, would like Schonert from Wuss.
Sops - Interestingly has been made official (move to Lyon) on Wiki. Never really got going and fallen behind Umaga/Atkinson as well as Minozzi/Miller/Simmonds. Will save some cash too. We also have Crossdale coming in who will likely cover fullback.
We always tend to be slow on transfers not because we don't have them but tend to go in batches. It wouldn't surprise me if TT is confirmed that we see a signing or a re-signing to offset it. If we see TT leave, i'd take it if we see a new hooker sign or more importantly Cruse/Bass resign.