I feel with their move to Television Centre which is a larger studio than TLS
Studio 1 was, it would give the production team the chance to revamp the show in a much larger scale.
The two year break also means they had the time to redevelop the show and create some new ideas, and revamp the older ones.
Win the Ads must be part of an advertising deal, so I do not see that section dropped from the show. It is called Saturday Night Takeaway, and the Takeaway part does suggest winning the ads in a very loose way to some.
With a larger Studio TC1 to play with, and possibly using the outside of this iconic building, there is more scope for a complete refresh of SNT in 2020 in my opinion - my opinion, I hasten to add, as I know I will get trounced on if I said this is what will happen for sure.