I had it on a DXB-DUB sector a few weeks ago, so yes new F is making some appearances on the DUB route. It's usually operating one rotation per week; if you look at seat maps the following seem to be the upcoming ones:
- EK163 and EK164 on April 19th
- EK163 and EK164 on April 26th
- EK163 and EK164 on May 2nd
- EK161 and EK162 on May 11th

I haven't flown EK long enough to determine how firm their plans are and how often they sub aircrafts, so cannot comment as to whether the above is reliable or subject to swaps.