I am going back to my Giant Yukon MTB hard tail cheap jobbie in the bad weather fantastic fun and great training as it is not the lightest
Ride enjoy and HAVE FUN
The more training miles in the winter the bigger your smiles in the summer
Just put in the miles on your mountain bike until you get your road bike, when you jump on a road bike then you will fly. I trained on a 20 year old mountain bike for 6 months before getting a road bike, you will enjoy the new bike all the more by being fit when it arrives.