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As someone who hadn't followed closely: the consensus is among miners, right? The network is still PoW, not PoS?

So it's not a consensus based on DAO shares or ETH holdings, which represent the broader community, but rather based on GPU power, representing a small number of groups?

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Yes, a soft fork means consensus (majority) among miners. The developers (of Geth, Parity, cpp-ethereum, etc.) can propose the changes, but it's up to the miners whether to adopt them.

Note that the Ethereum mining community is considerably more decentralized than e.g. Bitcoin.

Unless I'm reading this incorrectly, two mining pools control over 50% of the hash rate:

https://etherchain.org/statistics/miners

2/3 of the hashrate from three pools doesn't seem very decentralized.

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