If I recall correctly, off the top of my head, these are the main reasons why this is rumoured to be an RMC:
* RMC themselves have stated that "A park in Europe" has ordered a coaster from them.
* Alton towers have applied for a woodie before, but were turned down.
* The traditional type of wooden rollercoaster has been deemed too "old-fashioned" for the UK (for the lack of a better word, I'm pretty sure some of you will find a much better way to phrase this), but RMC's different take on the concept of a woodie (a composite coaster, if you like) combines the "traditional" style of woodies with the extreme type of ride that seems to be a prerequisite in the UK park market these days. Highly marketable, highly recognisable, a first in Britain for many years, and totally in the style of Alton.
* Ian from CoasterForce himself said on Twitter that he had insider information of a woodie coming to the UK.
Now, there may be even more facts I have missed, but these alone would lend a lot of credence to any rumours of Alton getting a woodie. You might even add a fifth little point:
* Coaster enthusiasts on specialized coaster sites such as this have long been craving a woodie for the UK. While a marginal group overall, whenever coasters are discussed on the Net enthusiasts will pop up and in some way influence the debate. Whoever reads an online discussion on what kind of rides the UK public would like to see, are likely to come across "Woodie plz!" at some point anywhere they look. From a marketing perspective, it may be (or appear to be) a large demographic to satisfy by building a woodie. And they aren't half-bad in regards to price either. Long-story-short: We're skewing the voice of the market.
Of course, there is a bit of a confirmation bias going on in enthusiast circles too. Since "everyone" wants a woodie for the UK, people are likely to think "this must be it!" whenever something new and surprising is announced. Rumours of wood are thus also a little more likely to spread and to gain traction.
At any rate, a combination of these factors makes it look really credible that Alton is finally going to get a woodie. And RMC are delivering just the right kind of woodie to fit at Alton to Europe at some point in the near future.
...Am I on the right track here?