If we're going off of current team strength, then I think we can divide the teams into this fashion:
The "Top tier": EDG, RNG, ROX, FW
The "Mid tier": G2, TSM, H2K, SKT
The "Very exploitable weaknesses but not totally dead in the water tier": SPY, IMAY, CLG, C9, SSG, AHQ
The "Almost guaranteed last place tier": INTZ, ANX
EDG/RNG/Rox are without question the top tier teams, boasting incredible diversity in playstyle and are almost guaranteed to be in the semi-finals barring a massive and shocking collapse. More importantly, three of these teams have a #1 seed meaning that the chances of them facing against eachother and/or drawing a "difficult" group is pretty small. G2/TSM/H2K/SKT/FW are good, but not great. Each of these teams sports one somewhat exploitable flaw (g2 has a relatively new top-laner, TSM's top/jg have been pretty average, SKT's top lane has a limited pool that is easy to exploit, H2K has a habit of ignoring "series metas" making their drafts pretty awkward), and should fight it out for the last semi-final spot. The next tier consists of teams who should fill out the bottom-half of the standings, with each of SPY/IMAY/CLG/C9/SSG/AHQ having one clear flaw which teams can thoroughly capitalize on (SPY/IMAY starting rookies, CLG/SSG being incredibly inconsistent at times even against weaker teams, C9 being too impact-reliant recently, AHQ having a mid-laner who is still easy to "ban out" in champ select). Final tier is reserved for the two IWC teams, as although I thoroughly expect one of them to pick up a win or two (ANX being the most likely), the competition they faced to make it to worlds was laughable in comparison to the rest of the teams.