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Is there a cap to the amount you will accept for this first tier? Or a way to track progress of the token sale to get an idea of what percentage we will actually get for our BTC?

You can see the amount donated in STEEM/BTS here:

https://steemit.com/@bitgate-ico1/transfers (donated in steem/sbd)
https://cryptofresh.com/u/bitgate-ico1 (donated in bitshares)

For bitcoin we are generating a unique address for each user, so we'll update as we go along. For now it seems around 30% in BTC, 40% in STEEM, 30% in BTS.