According to my tests on Beta, fallthru macros are pretty much dead. They fixed whatever it was that was allowing us to use it effectively on whatever we want. I just tested again and that's still the case.

This macro

Code:
/cast Stormstrike
/cast Lava Lash
should be simple and predictable enough. Not the case anymore. The only time Lava Lash will go off is as Storm Strike comes off cooldown, at which point Lava Lash will cast > GCD > Stormstrike. It won't go off again until both Stormstrike and Lava Lash are both off cooldown. This means Lava Lash can sit there waiting to be used for 8+ seconds until the cooldowns match up for both spells.

Code:
/castsequence reset=target Flame Shock, Earth Shock, Earth Shock
/cast Chain Lightning
/cast Lightning Bolt
Same thing here. Flame Shock casts, then you have to wait 6 seconds {shock cooldown} for ES to be ready, then it will cast Chain Lightning, then Lightning Bolt, THEN Earth Shock. Then another 6 seconds of the macro sitting there not doing anything until the next ES is ready.

From what I'm seeing, there isn't going to be one or two macros per toon, you're going to need a slew of steps.