Play Boosters deliver Standard playables with bonus foils, while Collector Boosters emphasize premium frames and serialized cards
So far in 2020, we've been averaging about one per month (and if you go back to the initial release in December, we've actually had 13 individual drops in three months, making the average closer to four drops per month since the series was announced), although the average is somewhat complicated by how you count themes that come with multiple drops, like the original Theros Gods during Worlds in February (technically, the Gods were five individual but related drops, although there is an argument for counting them as one big drop since buying all of the drops together was an option)
CONTENTS12 Doctor Who Collector Boosters, with 15 MTG cards in each pack
As confirmed by a Lorcana team member when I asked the question, locations cant be exerted because they already are
What does the shield symbol mean on a Lorcana card