Personally, I would wait as Cyan has only just started being rolled out for those on preview for developers for select models only. I recently went through an ordeal which lasted several hours to get cyan flashed onto my 920. I'm not going to go into detail what happened, as it would turn into an essay of post. never the less that was not a normal case as it is pretty painless.
However there have been some cases of people bricking their devices when flashing back.. most likely they panicked and let their phones run out of charge or tried a cold boot (turned it off by powering off completely or battery pull) or yanked the cable (that is what Leo Laporte did, he is one of the co-hosts of windows weekly lol and doing so bricked his 1520).
I would imagine given that Lumia Denim has been announced, you should get Lumia Cyan in a couple of weeks. Since it is a exclusive device (the lumia 930 which is the global version comes shipped with 8.1 and Cyan), it would be hard to gauge a narrower time frame.