Next Windows 10 Insider builds could have 'some really interesting things'

Windows Insider leader Dona Sarkar has posted word that the Windows 10 team has "some really interesting things" planned for the next Insider builds that could launch late this week or next week.
Windows 10 Mobile
No new builds today  tho we're hustling some *really* interesting things for you late this week & next week. Thank you! <3

It's very possible that some of those "really interesting things" could be related to what Microsoft might reveal on Monday, June 13 at E3 2016.