[JAS84]

I certainly hope they're not. Drama and Yesterday currently have very nice idents which have worked as a strong brand for years.

Drama's idents are 11 years old, they've been there since launch. They'd be easy to edit with the new branding as they are just logo over footage, but I won't be surprised if they're completely replaced.

Yesterday's 12 year old idents not being replaced would be a More4 situation (elements of the old logo still present in the idents), as the Y symbol interacts with the background. And unlike Film4 whose idents are similar, the new logo won't work in it's place as it's just a wordmark.