Part 1- it's -- 120, and I think it's a terrible idea for reasons I've detailed previously and Warstar (I think it was) mentioned shortly above. Our reliance (as players, not necessarily rogues in particular) at the start is 100% the same; our ability to GET procs at the start has been eliminated, so given luck swings, expect some high variance in opening DPS for your raid between pulls. Yay. If it were set to like 200 seconds since last pull it'd be a non-issue, but they'd need to either neuter the proc (perhaps give a weaker opening fight proc for trinkets?) or make the proc weaker and more common - for all big-effect-stack-with-CDs trinkets.
Part 2- This is fine, really, and it needed to happen, although I don't like being nerfed more than anyone else. The values they used for balancing against lost haste were laughable last I looked. Something like a 10% proc increase rate, when I'm used to having 30%+ haste increasing rates instead... is a definite nerf.
Poke- I actually do notice when I get a long string of good luck as well, but it's REALLY not as noticeable as when your trinkets proc right after all of your opening CDs wear off. Hate hate hate that. Which contributes to this being a poor system.
Fixed: 120s, missed an update while I was out of town. Thanks.