Interesting choice of words on the Yahoo television site -
![]()
I've seen that term ("flash sideways") used a couple times in publicity this season. Based on context at that time, I presumed it was referring to the alt-timeline where the plane didn't crash and watching how the characters evolved in that timeline (i.e. not a flash-back or a flash-forward in time...)
Any summary is going to be laced with interpretations (no offense, fba827). The last five episodes are currently on hulu. You might want to watch and draw your own conclusions -
Lost - Full Episodes and Clips streaming online for free - Hulu

(Dungeons & Dragons)
Rulebook featuring "high magic" options, including a host of new spells.