It definitely looks like something is being built there judging by that photo! I don’t think it’ll be a Thomas Land expansion, personally, as from what I remember from my last visit to Drayton Manor, the entire entrance path and Maelstrom, as well as the Carousel and the train ride (I think it’s Polperro Express?) sat between Thomas Land and G Force’s area, so they’d have to remove all of that as well if they wanted to link it with Thomas Land.
I do remember an interview with Colin Bryan that talked about a “family track ride” with a seaside theme for G Force’s area (this bit was abruptly removed from the interview), but I’m also open to it being something different.
I agree with
@AndrewRollercoaster in thinking that a small wooden coaster would be a fantastic addition to Drayton Manor. Something from GCI or the Gravity Group, even it was a tamer ride aimed at young families, would probably be in with a decent chance of being my favourite ride at Drayton Manor. Even though Shockwave was more fun than I was expecting, I think it is definitely quite an easily beatable roller coaster with modern technology, even if the ride is more family-focused, and I think a family wooden coaster would fit the park’s target market while also being appealing to enthusiasts. Wicker Man has proven that wooden coasters can be popular with the British public, so I think a more family-sized wooden coaster could work very well at Drayton.