You're welcome.
Mar Menor golf was the first Polaris World resort and as such it is well established; but it only has villas and houses on the complex, and as a result, no communial swimming pools. Some of the villas may have put small 'plunge' pools in their grounds.
The proposed expansion is not only for a further 9 holes on the course, but also for appartments and communial facilities.
Although the funding for the work to expand was well publicised here, I don't think any major construction has been started yet.
As a 9 hole course it is not particularly busy with golfers, so expect a quite holiday with frequent driving to more entertaining areas.