New Packages in MATE 1.8:
gssdp
gupnp
caja-extensions
yelp-tools
yelp-xsl
pygtksourceview
pangox-compat
pygobject3
gnome-main-menu
mate-screensaver

Renamed Packages in MATE 1.8:
mate-file-manager -> caja
mate-window-manager -> marco
mate-document-viewer -> atril
mate-image-viewer -> eom
mate-file-archiver -> engrampa
mate-menu-editor -> mozo
mate-text-editor -> pluma

Packages removed in MATE 1.8:
mate-file-manager-gksu            \
mate-file-manager-image-converter  \  merged into caja-extensions
mate-file-manager-open-terminal    /
mate-file-manager-sendto          /
mate-keyring (replaced by gnome-keyring)
libmatekeyring (replaced by libsecret)
mate-doc-utils (replaced by yelp-tools)
libmatewnck (replaced by libwnck)
mate-character-map (replaced by gucharmap)
mate-bluetooth (in broken state)

Note:
To enable side-by-side tiling via command line, run this command
$ dconf write org/mate/marco/general/side-by-side-tiling true

or you can enable it via System > MATE Control Center > Windows > Enable side by side tilling