Yes, Jeto can update your emails and landing pages with different values based on your segmentation.

Say, for example, you want to make your email title dynamic by geographical region (and you have 6 different regions: North America, South America, Europe, Africa, Asia, Australia), you would have 6 different tokens in Marketo and 6 different fields in Jeto to store the value of each:

Title - North America (default) - {{my.title NA}}
Title - South America - {{my.title SA}}
Title - Europe - {{my.title EU}}
Title - Africa {{my.title AF}}
Title - Asia {{my.title AS}}
Title- Australia {{my.title AU}}

The Collaborator would provide a value for each and the content will be dynamically updated based on the recipient's segmentation. 

It is important to note that the preview of Jeto will only display the default value that was selected for your segmentation. In the above example, Jeto would display Title - North America.