From an email I just received. Not surprised to see this given the impact to passengers from COVID-19.. Wonder if this is targeted..
REGISTER NOW EARN STATUS
50% FASTER Earn 50% more elite qualifying miles for a limited time. Just register and fly by April 11, 2020.*
The sweeter rewards of status 
GLOBAL PERKS COMING SOON. There’s never been a better time to be a Mileage Plan™ elite. Earn status in 2020 so you'll be ready to take advantage of expanded American Airlines and
oneworld® perks starting in 2021.1
GET A BETTER VIEW. Preferred seating, plus First Class and Premium Class upgrades, when available.2
SKIP THE LINE. Priority check-in and boarding for
less waiting at the airport.
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*Eligible members who register for this promotion before their first qualifying flight will receive a 50% bonus on elite qualifying miles earned on flights marketed and operated by Alaska Airlines or Horizon Airlines between March 7 and April 11, 2020. Mileage for qualifying flights must be credited to the member's Mileage Plan™ account. Not valid on free or award travel. The bonus elite-qualifying miles awarded as part of this promotion apply only to the number of miles that count toward elite status qualification and will not be available for redemption. All
terms and conditions of the Mileage Plan program apply. 1Alaska Airlines has announced its intention to join
oneworld® alliance in 2021. 2Saver fares (booked in X class of service) are not eligible for elite upgrades.