I went just yesterday. (March 2). Immediately upon gate open, I waltzed over to Savi's and requested a standby. They immediately invited me in, put me on a dot and within minutes I was on my way to Lightsaber heaven.
Thank you for the notes!! How cumbersome was it to them have your lightsaber with you all day? Did you miss out on a lot of rope drop shorter lines doing savis first? Tell me all Jedi master!
There were several others who did the same. I get the feeling that reservations begin at 9, and pre-official park open is the time to grab a spot if you are without one.
Best of luck and MtFBWU!