The current issue of the Club Magazine has apparently noted that the fourth Subscription set (Thunder Mayhem & Impactor)
will start shipping in April (after BotCon which is in the first week), with each toy being send out 3 weeks apart... further supporting the suspicion that they are trying to squeeze in the fifth Subscription set before the end of the year, as if their license ends this year.
This could mean that the fourth set could be sent out by the first week of August, giving them 21 weeks to get the fifth set sent out, when they only need 18 weeks at this 3-week schedule.
That could give them enough time to get the pre-orders done in March/April (which are often only about 2-3 weeks), and get the toys made and sent to them by August/September.
So, giving FunPub a week to get back from the convention and get back to their usual routine, these are the likely postage dates for the fourth set...
Toy 1 - Week starting Monday April 18th
Toy 2 - May 9th
Toy 3 - May 30th
Toy 4 - June 20th
Toy 5 - July 11th
Toy 6&7 - August 1st
That gives them until September 12th to then start sending out the fifth set at 3 week intervals, to still get the last one posted out in the last week of the year.