Bing announced they have improved the import feature from Google AdWords to Bing Ads. Specifically you can now import more from Google to Bing, including more in quantity and more in terms of data.
Here is what you can import now:
10 thousand Campaigns
1 million Ad Groups
5 million keywords
4 million ads
2 million ad group-level and campaign-level negative keywords combined
2 million ad group product partitions
200,000 all other entities combined
Aage and gender targeting
Negative keyword lists
There is a Show Advanced Options and see all the additional items you have the option to include or remove as part of your sync with AdWords:
Forum discussion at Twitter.