It's interesting to note the press release uses the phrase "special slot" and does not specify how long this slot will be, even approximately. If the slot was 90 minutes long then potentially they could hand over to BBC News slightly earlier at 00.10 (allowing 5 mins for weather for the week ahead). Alternatively it might be just 30 minutes long on some nights, with some non-BBC Three branded content to allow for any nation opt-outs.
Worth noting tonight after the news the two programmes being shown are BBC Three programmes according to their programme pages. (22:45 Inside the Real Saudi Arabia, and 23:35 Brainwashing Stacey.) With that in mind I wonder how much of this press release is PR spin for what's already partly happening, and is attempting to hide some more cost cutting. Worth noting they coincidentally decided to also announce the return of Crackerjack yesterday, which happily for the BBC the tabloids ran with instead of the news being shortened or cost cutting.
"Listen, we've all got something to bring to this conversation, but from now on what I think you should bring is silence." - Rimmer