According to the latest newsletter from ScotlandsPeople.gov.uk, the following data has been added recently:
New 1881 census
indexes and images: this now completes the set of Scottish census records 1841-1901, uniquely available on ScotlandsPeople. Please note that this new version is in addition to the current LDS version of the 1881 census (which does contain images)
Old Parish Records (OPR) Deaths & Burials indexes and images have now also been added from 1538 to 1854
Coats of Arms 1672-1907 (free to search) have been added