I think oregonred answered your main question, but this is the outline of the two scenarios here:
Reds Wait to Promote Bruce: No Super-Two Scenario
2008 (0.120 service time after season)
2009 (1.120 service time after season)
2010 (2.120 service time after season)
2011 (3.120 service time after season)
2012 over 3.000, gets arbitration -year #1 (4.120 service time after season)
2013 over 3.000, gets arbitration -year #2 (5.120 service time after season)
2014 over 3.000, gets arbitration -year #3 (6.120 service time after season)
---------
Reds Promote Bruce Now, He Becomes Super-Two
2008 (0.135 service time after season)
2009 (1.135 service time after season)
2010 (2.135 service time after season)
2011 Super-Two, gets arbitration year #1 (3.135 service time after season)
2012 over 3.000, gets arbitration -year #2 (4.135 service time after season)
2013 over 3.000, gets arbitration -year #3 (5.135 service time after season)
2014 over 3.000, gets arbitration -year #4 (6.135 service time after season)
---------
The difference is basically the 2011 season and what the Reds will pay Bruce in that season.
If he's not a Super-Two, then they'd pay him probably around 500k to a million bucks (most teams will pay a couple hundred thousand more to star players during those league min years as a sign of good faith).
Or they bring him up now, he becomes Super-Two, and he goes to arbitration in 2011. Then the Reds could be paying him well ... who knows. Maybe $3 mil if hasn't produced much. Maybe $6 mil if he produces ok. Maybe $10 mil if he explodes.
Free agent service time will not be affected. My guess is Bruce being a Super-Two would cost the Reds somewhere between $5-10 mil during the 2011 season. That's when fans have to ask themselves if two weeks of Bruce in May, 2008 is worth paying him an extra $5-10 mil in 2011.