Another featuring on the new Simple Plan record?

For a few days now we already know that there should be some sort of a secret featuring on the new Simple Plan album – that means a special guest, who would be singing at some parts of a certain song. The first recorded featuring was mentioned by Jeff at the beginning of November. The second one we’ve learned about only a couple days back, when Pierre and Chuck recording some special vocals in LA.

Today, Jeff unleashed on his Twitter the following:

It doesn’t stop: someone really awesome just contributed a guest vocal on the record at the last minute. will tell you, just can’t right now.

So what do you think? Does it all mean we can expect more special guests or just one? And who might it be?