As expected there will not be any changes in terms of gameplay. It will basically be the same game for tablets and computers, meaning that your cards are the same, the mechanics are the same, the rules are the same, the only main difference is that your user interface has been scaled down and optimized for smartphones which tend to be smaller than tablets.
The accounts will also be shared amongst your devices so if you play Hearthstone on your tablet or computer, your progression and the cards you’ve bought or earned will remain with you even on your smartphone, so gamers will be able to pick the game up on any device and continue where they left off.
Blizzard has also announced an added perk which is that gamers who play the game on their smartphone for the first time will be able to nab themselves a free Classic card pack. They will need to participate in either the Play, Arena, or even the Practice mode to get it. If you’d like to get your hands on it, pop on over to the iTunes App Store, Google Play, or Amazon’s Appstore for the download.