Yes, Chromecast will have more native support this year. Whether that is from a service you want is a different question. But Google have committed support for the Chromecast by adding it into their new Android TV platform.
4oD is unlikely until they complete their change into the new format is underway - that is, "All 4" which is due to begin sometime in the 1st quarter. However, there is no word if they will then implement Chromecast support, but it is more likely they will do so under All 4 rather than 4oD
The only way to know about TVPlayer is to ask them. The more people that request it, the likelier it will appear. TVPlayer is an interesting one, as they stated early last year that they planned Chromecast support, but it never happened. Perhaps they had to mothball plans for some reason.