The club proposed 6,250 in the SS and NS in their planning application and then, with the added pitchside seating they proposed a maximum capacity of 62,170 (up from 47,670).
Hosting the CL final is irrelevant, when you have the Tottenham Hotspur stadium and Wembley in England we're not getting it. UEFA can make much more from those bigger grounds.
I've said many times, the club references 70,000 in the DAS (Design and Access Statement) from that original application. They've already explored the future East/CB expansion to ensure that works to those stands do not require further amendments to the North and South Stand. The corners are therefore temporary structures that would be amended and tied into any expansion of the East and West where the roof would be amended to follow the pattern with the South Stand - aimed down towards the pitch and capable of provided additional seats. The image I included shows a much bigger provision of seating on the third tiers in the side stands. It's purely indicative at this stage.
They will want to have one of the premier club grounds in England which will be done through capacity and hospitality offering. The ground might not be as good as Spurs' but if it's got top level corporate facilities (which it can have) and has another 10,000 seats compared to Spurs it can compete to a degree. The London market makes it a tough job so we need more overall capacity for both offerings to compete revenue wise I'd imagine.
We'll see what the club comes up with. The fact they're looking at external changes means we need planning permission and they've probably looked at the future for the East and CB stands and hopefully revised the NS proposals to be a two-tiered stand. We know from the work on the training facilities they do their homework. They'll have done all the research they need to. The Tunnel Club was nicked from the Dallas Cowboys iirc. I'm sure they'll be providing something epic for hospitality in the future, and will, if they can provide something epic for your average fan as well. Hopefully that includes a home end - but we shall see.
Talk has ramped up which suggests plans may be out soon. They turned around the last application in about 3 months which, from experience, means they discussed it with the Council through pre-application meetings for quite some time to get them onboard. If we want to start when the arena finishes then that application needs submitting fairly soon. If wider development is taking place then it could mean a longer determination period - a hotel or bars/restaurants etc will have bigger impacts which means more comments/consultation.