I guess they take over all servers and clients mean, only changing the owner of the company, and may let Darren and Gavin to keep running the business using Leaseweb's fund, but do not change much on Rs's business model.
Sometime, a company having financial crisis does not mean their business model is bad, they just need more money support to make them growing big.
In my opinion, rapidspeeds is on the road to success as they have an unique groups of customers (warez, pt, video streaming.etc), they earn profit from these groups of unique customers, which is better than many hosting companies which do not have an unique group of customers, so they have less power to compete with other companies which is offering similar products.
I really hope the transition of the business goes smooth, so we will able to backup our data, then reconsider whether we should stay or move to elsewhere. If they do good, I am sure I will return to Rs, as there isn't a big problem beside this 2 days down incident.