Rylan is the only person on the alumni I'd be happy to have back. He's really turned around perception of himself in recent years and I think is genuinely one of the most liked and one of the best presenters around. Just like with Davina leaving Big Brother actually opened doors for him that otherwise would have remained closed, and although at one point he did seem to have shows on the BBC, ITV, C4 and C5 he is nowhere near as overexposed as he once was.
Is some talk of him possibly co-hosting with AJ. You remember her from his first year doing Bit on the Side and she was pretty awful and axed after one series. However she's turn it around a bit in the last couple of years and an appearance on Strictly (Dancing with the Stars) and reaching the final, but then getting injured and having to withdraw, has somewhat given her "nations sweetheart" status. She also fronted a one-off revival of The Big Breakfast (the show that gave me my online identity) last year. I was so underwhelmed when she was announced as host but she turned out to be absolutely brilliant and controlled a fairly manic two hour live show with ease.
Whatever happens though please for the love of god don't bring back Marcus. He may be the voice of Big Brother to many but he's an instant turn off to me and thankfully reality TV narration has moved on so much in recent years I don't think he'd be in the frame. I think they'd want someone who is naturally funny instead. Less is more though on the narration.