As a guess (and *only* a guess), I'd maybe say they're switching to a new custom dialup protocol. Why they're doing this I have no idea, but improving services for their customers sounds like a line of bull, especially since their service is hardly famous for customer support, and other ISPs with better services seem to manage ok on PPP, PPPoE and DHCP.
Do you actually want to know what this "Super Software" actually is?? Do Ya??? Well all it is is a custom dialer with NTL stuck on the front of it, nothing more, nothing less, oh, and it occationally hangs, its the same software Tesco.net use (whose service coincidentally hangs off of NTL). So, copy down the number, discard buggy software, tap in your details and vioala! Instant internet connection. I do however feel that providing second rate software when there are perfectly capable built in systems (indeed, the built in Windows Dialer pops up when you get disconnected and can be set to automatically reconnect - the ntl dialer doesn't have that option) astounds me. Also, the software forces your browser to go to the ntl homepage (as the tesco.net one sends you to the tesco homepage) wether or not its actually set as your homepage when you first connect...
Freeserve lost my custom because they were forever messing me around with poor service and ever changing numbers... ending up with... you guessed it - a custom dialer...
Way to go F%cktards....