I hope and think that Oly will do well by this camera -- by that, I mean, sell lots. Let's hope so! Why? It's good for all of us, even if you're brand loyal to someone else. Helping forge a market can only mean better high IQ travel cameras for all of us.
I won't be shelving my DP-1. What it does well, it does really well -- there are those Foveon images that just astound. I wish, like many Oly users have lamented, that Oly had delivered a Foveon camera but they didn't. So I'm hoping that Sigma will continue to raise their benchmark.
I'm not biting on the E-P1 yet. I've stated elsewhere (on the Oly forum) that I felt the camera wasn't targeted for me -- obviously more towards the boutique crowd with its design and flavours, features that don't interest me like art filters, etc. But hopefully Oly will be successful with their launch to prompt a rumoured pro level travel camera (read: weather sealed, quality glass that meets the 4/3's telecentric standards, etc... you know, that mythical decisive moment camera. Well, at least one I can afford

. I'm hoping Sigma is making headway with advancing Foveon technology but we all know its limitations. Depending on the speed of development, an Oly may make its way into my street kit down the road.
In the meantime, there is the Pentax K-7 to look at for a compact DSLR system w/primes. It's shaping up to be a great year for tools which bodes well for all of us.
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S
Olympus E1 11-22 14-54 50 50-200 EC-14
Leica M4 28 35 50 90
Sigma DP1