The upload is taking its time, and I can't say exactly what its final make-up will be, but so far I can confirm that the 1916 births (the rolling year from 100 years ago) are available, and the index + register image of marriages from 1869/1870 to 1881 seem to be going live in steady fashion (the 1882-1940 records were already fully online). For my own family, I can see register images of marriages in Cork, Tipperary and Wicklow for those dates. I'm getting mixed results for death records, with either no results appearing if I narrow down my search, or loads of results with no images for pre 1890. Possibly the death records will go live later. For deaths, the 1891 to 1965 index + register images are already online, so it's the pre-1891 and the 1966 updates we're hoping for.
I'm sorry I haven't got time to do an indepth analysis right now. I'm in a hospital with my mother this afternoon, so this will have to wait until I have more time, which may be a day or so. (She gets priority!)
In the meantime, I'm sure you can all go hunting for yourself! Have fun!
Update, 16 November: See blogpost.