There are still a lot of questions to be sure, but there are some good beginnings of answers as well. Since this update was rolled out over months and in three distinct phases, it has been much more difficult to determine what factors have been given more or less weight.

What are some theories? Here are some of the top ones and, this is not a full list; there are most likely numerous other factors that affect Google rankings after Jagger that no one has recognized at all yet. Read the following.

Factors That Could Possibly HELP More in Jagger's Aftermath

Aged Domains - Sites with domains that are older rank better now - the older the domain, the better its rankings with all other things being equal.
Very Relevant Links - Inbound links and outbound links relevancy is more important after Jagger. This means that if you point to related sites or you get links from other sites that are related to your website, you may rank better after Jagger with all other things being equal.
Links From Trusted Sites Help - Trust Rank is more important than ever after Jagger. Trust Rank is a concept that says if you get a link pointing to your site that is highly trusted by Google then you will rank better with all other things being equal.
Variety of Links - Links from .edu and .org websites are good for increasing your rankings and are more important than ever.
Aged Links - The older the link that points to your site, the more weight it's given now.
Embedded Links - Links that are embedded in sentences and paragraphs instead of stand-alone links are weighted more heavily now.
Article Links - Articles are what directories had been a year or two ago for link building. Links from the author by-line or within the article that point back to your site will positively affect your rankings.
Fresh & Unique Content - Now, more than ever, regularly updated and added ordinal content will help your rankings.
High Traffic & Stickiness - User popularity statistics now, or will soon, affect rankings. In other words, user actions on your website, like how long they stay (stickiness), how many pages they visit, and even how many people visit your site in a given period, can all affect how Google ranks your site.

Factors That Could Possibly Not Help Anymore, or May Even HURT More In Jagger's Aftermath

Duplicate Content - Any kind of duplicate content can hurt your rankings. Some say this only refers to other sites having the same content as you while others say even duplicate content within your own site can be bad. I find the latter hard to believe since all sites have repeating slogans, phrases, checkout instructions, or any number of other duplicate sentences within the same site.
Hidden Text - Hidden text within your html, in div tags, CSS, or comments, can negatively affect your rankings.
Decreased Rate of Link Building - The speed and volume of inbound link creation to your site from other websites, if changed, can negatively affect your rankings more so now.
Linking to Bad Neighborhoods - Reciprocal link trades hurt your rankings when you link to sites that are considered 'bad neighborhoods' by Google, such as link farms or sites that are banned by Google.
Link Schemes - Participating in link schemes such as Co-ops or Link Vault can hurt your ranking more than help them.

A clean, simple, fast-loading site with natural links pointing to it from a variety of other related websites, some .org's and .edu's, others from trusted authority sites, and many from small related websites, that adds fresh and unique content daily, will rank well in Google over time and won't be affected by any update, including Jagger.

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