I have seen speculations and rumors on this forum since a year back regarding replacements to the 430EX II, but nothing has materialized. On the other hand, there are significant rebates on the 600EX-RT, which makes me wonder if Canon wants to abolish this second line of Speedlites altogether? What do you guys think? What are the relative merits of having a cheaper 600EX-RT vs a smaller 430EX replacement.