Capacity significantly reduced I'd say, though the clubs hands were tied as there was a league-imposed March deadline to meet (ridiculous in the current circumstances in my view, but not the clubs fault) and this was the quickest and most cost effective solution.
Roof cover over the school end would be great, as would terracing along the far side of the ground (there's plenty of room for it I reckon) but it all comes down to £££££.  I wouldn't be surprised if there are further plans for ground development but, given the current state of affairs, I'll be just pleased to go back to HP and watch football next season.  

It'll be interesting to see how it works in reality.  The Town End is all seated at the County Ground, but the majority just stand.