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Several components of webOS have not (yet?) been made open source, but much of what makes the system work has been.
It's not merely a removal and replacement of formerly proprietary code, the basic components that make up Open webOS have been significantly upgraded, for example, the TouchPad used Qt 4.6, I think, and Open uses Qt 4.8 (i know 0.2 increase doesn't sound like a lot, but in Qt 4 terms, it's years of development), it uses a much newer QtWebKit, hundreds of packages are much much newer and using a lot fewer custom bits outside of the bits that actually make it webOS.
Upgrades are still happening, as you can see if you follow the development branches, much work has been done to convert the system to work in Qt5, and to rebuild a lot of bits that were engineered in ways that don't really even make sense to anyone anymore.
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