Hello H.!
DO NOT TRY THE POTTY TRAINING YET!! Too many transistions in your child's life will ultimately wear you both out and w/ a new baby ont he way............not a good thing.
You are moving new home, you want to move her to a toddler bed, you are having a new baby....just naming all of this is stressing me out, can you imagine what it will do to her??
Go slow w/each transition please, you will regret it if you do it quickly. Kids like schedules, boundaries and the same thing done over and over again and changes do affect kids in many different forms. Behavior-wise and emotionally. Some kids do better (depending on their age) when changes are made, but most do not.
I would first start on the bed change, (especially if you need the crib for your new one) leave her baby bed up in the room even if it crowded and get her excited about the new bed and how much of a big girl she is, let her play and lay in it and pretend if she wants. We had to do this for a week, before my son finally hugged his crib and said good-bye to it and felt comfortable in his toddler bed. He wanted back in his crib the first 3 nights, so don't take it apart or down until she has accepted the toddler bed.
On moving, wait at least 4 to 6 weeks before even approaching the subject w/her about having her new room, more space, more exiciting...etc... are you building? If so, it is good to take them w/you when you do this, so they can see the transformation that is taking place in their new house. We are moving this month (been building since September 2006) and again it is tough sometimes and he cries, but we just keep getting so excited about our move.
I would really wait to talk about a new baby until your move and give it again another 4 to 6 weeks, you child may adjust just fine, but give them the time. If you want to start maybe in October about the potty training, maybe, but remember a new baby will be coming in December and they do sometimes revert back to being a baby......give it time and you guys will be fine. It will be tough and I hear girls do better potty-wise, so you just never know.
Sorry so long, but I have seen several of my friends go through HELL transitioning their kids too soon.
Good Luck!
G. B.