IE900 was just wishful thinking.
IE80 was released near the end of 2011. IE800 was released in early 2013. Two years have passed. I think it's natural to expect a new TOTL IEM from Sennheiser after 2 years. Rivals have been doing amazing things. Noble K10 Universal, Earsonics Velvet are both great IEMs, and new ones keep coming. Are they better than IE800? That's subjective. There are areas Sennheiser can improve though.
- They can improve fit. Yeah comfort is great, but they kept falling from my ears when I had them.
- Another thing is we need a damn iPhone cable. There's an Android cable which is very expensive. Like their new Momentum IEMs, they should include phone cables too. In fact one phone cable and one regular cable.
- Cables should be removable.
- Microphonics of the cable should be reduced.
- A portable amp released by Sennheiser to drive these to their full potential (as well as Momentum, Urbanite etc.) would be good. HDVD800 or HDVA600 in mini form. We don't need a dac though (mobile phones have decent dacs now).
- Obviously improvement of sound quality is important too. I'm sure they can improve it. Maybe the option to tune the sound like SE846 or Earsonics Velvet? That'd be good.