Aul is Microsoft's Engineering General Manager and had been responding to support questions on Twitter.
Keep in mind that Aul only confirmed the first Technical Preview would support the older less powerful devices, so it is unclear whether subsequent releases will have the same support.
Microsoft has not fully confirmed its supported Windows Phones for Windows 10 Technical Preview, but we should know more in the coming weeks.
@Qushery @NicholasHayman Hmmm. Do I cave? Don't think you can squeeze anything ELSE out of me:-) Yes, we'll have 512MB devices for 1st prvw.
-- Gabriel Aul (@GabeAul) February 5, 2015
Written by: Andre Yoskowitz @ 8 Feb 2015 9:28