1.4 clients will connect to 1.5 clients with no problem. I tested it. About 1.3.3 clients - I got the impression that before the first time it shows the upgrade notice, it tries many supernodes and shows only when it is unsuccessful. I may be wrong however.
But anyways - 1.4 clients will have no problem to connect to 1.5 superpeers - they are fully compaible. I tried it.
I think you did not fully understand this- 1.4s will connect to BOTH 1.5 AND 1.3.3. And even if the final move to Morpheus isn't successful - I think a 1.4 network is better than a 1.5+ network, it has less of KaZaA's sneaky features.
Please, correct me if you think I still don't understan
Thanks