Apologies if I duplicate advice already provided I haven't read all of the replies to your post.
You will need to establish what the lettings policy is on the social housing if it is rented.
Who is letting it, is it the LA or a social housing provider. If its a provider do they have a local lettings agreement for the development with the LA?
Social housing can also be shared ownership, rent to buy etc. Are any of the plots these?
This will give you an idea of who your neighbour's will likely be.
If the LA have anything to do with it and its just the standard lettings policy you will probably end up with people who are classified as band 1 or 2, this could be people currently living in temporary accommodation, severley overcrowded, medical need etc
How many bedrooms do the houses have? If they are family sized houses you they will let according to bedroom need. If they are 1 bedroom then thats where alarm bells would ring for me. As this will likely be single people living in temporary accommodation, in my LA this would result in a high number of single males who have recently been given right to remain in the UK who are currently residing in hotels at a high cost to the LA.
In my LA all new build social housing to rent although owned by a social hosuing provider comes through the LA and is let according to the standard lettings policy, its only when the first tenant moves on that the social housing provider can let the property using their own policy which includes working people having a higher priority.
In my previous job I was a service lead for policy and strategy in housing. My advice would always be to read the policy and dont trust a word a developer says!