Thank you for your suggestion alvinsr! Being able to choose user made decks for the AI has been requested before, but it's still good to hear from other users so that we know the feature is something people are actually interested in!
As far as being able to do LAN play, I think this would be a great feature as well. There could be times where I could be in a situation where me and my friend both have our tablets with us but no Wi-Fi connection, so it would be great to be able to use Wi-Fi Direct or something similar to be able to play against each other!
About being able to choose who to play with when you go online (AKA your friends), I'm sure that's coming! It's been requested by other people before and I myself have told Percival that implementing the Play Game Services API should take care of that.
About importing and exporting decks, you can do this right now! Just copy over your .ydk files from your PC to your phone's storage. You should see a folder called "ygopro" on your phone's storage and then another folder called "deck" inside of that one. Paste them in there.