The details are a little murky as reported.
The fact that Sky have not outright denied this, but would appear to be taking their time to reply (or construct one) leads me to think that this is going to happen.
From what I can make out,
- The increases will not apply until January 2010 if you already have a Sky HD / Multiroom subscription.
- If you already have Sky Talk.
To be affected, you would have to be a Sky BB customer, with no HD sub or Multiroom, and no Sky Talk subscription.
But I think the best thing to do is wait for the official response.
Like others though, I don't want Sky Talk, or I would have already signed up to it, and if I am affected, I would consider O2 for an extra £2.50 per month, instead of giving an extra £5 to Sky. I have no issues with my BB, but Sky need to realise, O2 are just as cheap, and are increasing their signups according to their latest results. Unlike other ISP's who are physically losing theirs.