Just read the synopsis and it sounds like it'll be very similar to the 1st.
DJ is late pregnant and she's a widow (like Danny) who has 2 kids already, she finds extra help in her sister (Stephanie) and best friend (Kimmy) who end up moving in to help her out..
Everybody except the Olsen twins will return (Still no word on Steve aka the voice of Aladdin, Uncle Jesse/Joey/Danny will be all together for at least 2 episodes but they're each speculated to show up for a minimum of 4-5 episodes in the first season.