I got it too. Called the centre today to clarify something regarding it, and the lady was very aware of the offer. So while it may have been targeted, the fact the center are made aware suggests it was probably a wide target.
I previously suspected it was because i'd booked my second QF itinerary for my membership year in the last few weeks, one of which commenced yesterday; and that i'd still be 100 odd sc short of gold requal when completed.
The email was littered with references about the benefits of obtaining platinum though - I notice there's a few above who are SG or WP - what did the WP's email say? The benefits of obtaining P1?
Edit: Redroo, can I make a suggestion, "Enjoy 50% bonus Status Credits on your next Qantas flight" is a bit misleading, as I have upcoming (but booked prior to the promotion) QF Flights that won't qualify for this offer. It is clearly spelled out in the T&Cs, but the header suggests it's the next flight, not the next booking.