The Sans Serif italics have shipped to Google. I am not sure when they will go live as usual but perhaps sometime in the next week or two. Although as always I still see things I would like to improve over all I am very happy with them. Maybe happier than with the rest of the family at this point. The glyph set match the extensive set seen in the Sans. The Serif will be updated next so that it has this larger glyph set as well.
Here are some screen grabs to give you a sense of what the fonts will be like when they go live at Google Fonts.
You may have to click on each one to see it properly
The first is the web site http://www.fuchsundhase.de/aktuell/
Here I have replaced their fonts with Merriweather Sans Book and Merriweather Sans Italic.
Keeping the German theme here is the Lufthansa airlines web site altered to use only Merriweather Italic and the Extra Bold Italic
Here is a zoomed section showing a bit more detail in the glyphs
I expect that I will post at least one round of bug fixes this year so if anyone does find problems or has suggestions please do let me know.