It has been confirmed that Beyonce will be appearing on Lady GaGa’s The Fame Monster releasing in November! She will be featured on the track Telephone which was produced by Rodney ‘Darkchild’ Jerkins. Here is a review done by PopJustice on ‘Telephone’:

‘Telephone’
Waffle: A song about being pestered by someone on the phone when you’re trying to have a dance in a nitespot. It’s a little bit like Gwen’s ‘What You Waiting For?’ meets Timbaland’s ‘The Way I Are’ meets about fifty other things. “I cannot text you with a drink in my hand,” Gaga notes at one point. The structure’s quite exciting: quiet harpy intro / “kinda busy, k-kinda busy” bridge as beat kicks in / verse / chorus (”stop calling, stop calling, I don’t wanna talk any more”) / postchorus bit / ‘The Way I Are’-style rap / Beyonce rap (”should have left my phone at home cos this is a disaster”) / breakdown verse / “kinda busy” bridge / chorus / another bit / ‘The Way I Are’ rap bit / extra ‘My Humps’-esque (but not really) “my telephone! My telephone!” outro, then “we’re sorry, the number you have reached is not in service” operator message. We love Beyonce insisting that some bellend on the other end of the phone won’t make her get her coat any faster.

Bonus fact: The guest vocalist on this was going to be someone else, but then the guest vocalist wanted to put the song on her own greatest hits album, so Lady Gaga made alternative arrangements.
Verdict: 7/8