The EOS Tokens are claimable now. They are trading live on some exchanges (Yunbi, Etherdelta, HitBTC). Kraken just added EOS trading as well.
Possible strategy with EOS, buy tokens from the ICO which is somewhat difficult to do, sell for a profit on exchanges. Re-invest funds into future EOS windows to get more tokens.
Future EOS windows almost are certain to come in at cheaper pricing. The main reason being for the 60+ cent pricing to hold from the first window, EOS would have to raise 1.2 million dollars every 23 hours for the next 300+ days. Quite unlikely to happen.
The best way to look at EOS at this point is as a coin with 1% dilution in this first 23 hour period, and the dilution % drops daily as 2 million coins arrive into circulation every 23 hours. After about 100 periods, it drops down to 0.50% dilution daily. Keep in mind I'm using my way of calculating this: (coins created)/(initial coins) = dilution ..... The correct inflation formula is a little different if anyone wants to be technical about this.
It could be a great arbitrage opportunity for some people. On the exchanges today, EOS is holding at about $1 with 12 million dollars in 24 hour volume.
That said, if prices crash on an exchange, expect to see people already invested in a given window to get burned on the pricing. Then very likely, the pricing of the next window would trade much lower to match outside demand.
At this juncture people will be comparing market prices vs. EOS ICO prices and due to the problems with getting into the ICO, the ICO stands a good chance of remaining the cheaper end of the transaction.