Good news. The third omni should collect then:
DC Universe #0: "Let There Be Lightning" (with Grant Morrison)
Flash: Rebirth #1–6 (2009–2010)
The Flash: Secret Files and Origins #1 (2010)
The Flash vol. 3, #1–12 (2010–2011)
Flashpoint #1–5 (2011)
or perhaps I miss something?