Just watched the season premiere; it's a very good jumping on point for those who haven't watched this series (the show also got a new logo). The new characters are nicely introduced--it's nice seeing Maggie Grace again on TV, and even Garret Dillahunt's gunslinger character makes a good first impression.
Morgan's journey from Virginia to Texas takes about several months, and while there was a clear several year gap in the timeline between TWD and FTWD, Morgan's appearance here means that the two shows now share the same timeline, and the Clarks (plus Strand) have moved from Mexico to Texas.