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"The development model has not been officially explained and so it is hard for developers to get a headstart on the new platform," Hilwa said Friday. "On the other hand, investment in the 7.x Silverlight-based model is winding down -- resulting in less than ideal application availability for the next few months in general, and especially for 7.x device owners."
Unofficial info from the leaked SDK (software developer kit) suggests that the development model, while similar to Windows 8, is not identical, Hilwa noted. "Similarity is good as it drives more convergence across form-factors which can leverage the same or similar code-bases, but differences can highlight that yet another potentially disruptive change may come down the road," Hilwa said.
Having seen the platform go through many changes, Hilwa believes that developers would be wise to have doubts. "Overall however, Microsoft is on track to converge platforms, but they have to work harder not to leave devices and technologies behind in the future, as it can impact the long-term credibility of the effort," Hilwa said.